On-slope shift control method for automatic gearbox of heavy-duty vehicle

A technology of automatic gearbox and gearbox control, which is applied in transmission control, components with teeth, belts/chains/gears, etc. It can solve problems such as driver fatigue, power interruption, and difficulty in shifting, and achieve improved Effects of economy, improved power and drivability, and improved shift quality

Active Publication Date: 2019-09-03
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, manual transmissions have defects such as difficulty in shifting gears, power interruption, and the driver's level has a great impact on the driving performance of the vehicle, and frequent manual shifting is likely to cause driver fatigue, which increases the unsafe factors of driving.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A method for controlling gear shifting on a ramp of an automatic gearbox for a heavy vehicle, including a method for controlling gear shifting under climbing conditions and a method for controlling gear shifting when starting on a hill;

[0055] The gear shift control method under the climbing condition is as follows: the transmission control unit TCU first determines the percentage of the grade of the slope quality according to the estimated vehicle mass and slope value based on the extended Kalman filter algorithm, and determines the percentage of the grade according to the estimated vehicle mass value. Its corresponding load level is light load level, medium load level or heavy load level, and then determine the corresponding climbing level mode according to the percentage of the slope quality level, and then calculate and calibrate it according to the engine characteristics and vehicle power in advance. The throttle opening-target gear table in this climbing level mo...

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PUM

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Abstract

The invention relates to an on-slope shift control method for an automatic gearbox of a heavy-duty vehicle. The method comprises shift control under a climbing working condition, specifically, a gearbox control unit TCU firstly determines the slope-mass grade percentage according to a calculated vehicle mass and a slope value, then determines a corresponding climbing grade mode according to the slope mass grade percentage, and then checks a pre-calibrated accelerator opening degree-target gear table under a climbing grade mode to obtain a target gear, and finally a gearbox executing mechanismexecutes gear shifting operation according to the calculated target gear and a gear shifting instruction, wherein climbing grade modes comprises a low-level mode, a middle-level mode and a high-levelmode. With the influence of the vehicle driving state, slopes and the mass on gear shifting considered comprehensively, the design adopts a regular logic control strategy, not only improves the economy of the vehicle, but also improves the power, drivability and system stability of the vehicle.

Description

technical field [0001] The invention belongs to the field of shift control of heavy vehicles, and in particular relates to a ramp shift control method of an automatic gearbox of a heavy vehicle. Background technique [0002] Automobile manual transmission has the characteristics of high efficiency, low cost and mature production technology, and it is still the mainstream product in the transmission of automobiles (especially heavy-duty vehicles). However, manual transmissions have defects such as difficulty in shifting gears, power interruption, and the driver's level has a great influence on the driving performance of the vehicle, and frequent manual shifting is likely to cause driver fatigue, which increases the unsafe factors of driving. Automatic mechanical transmission (AMT, Automated Mechanical Transmission) has become the preferred target of heavy-duty vehicle automatic transmission technology due to its simple structure, low technical difficulty and low development c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/02F16H61/18
CPCF16H61/02F16H61/18
Inventor 张彦康
Owner DONGFENG COMML VEHICLE CO LTD
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